Heinrich, German bacteriologist, 1876–. Conradi-Drigalski agar - a selective, nutrient medium for isolation of Salmonella typhi and other intestinal pathogens from fecal specimens. Synonym(s): Drigalski-Conradi agarDrigalski-Conradi agar - Synonym(s): Conradi-Drigalski agar